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Old 07-17-2013, 11:42 PM   #21
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I was going to put it in tomorrow after work but it's so god dam hot during daylight that I figured I'd give it a shot in the dark since it's a bit cooler here at 11:30 at night

Started right up, since it's dark I noticed that the check engine light is constantly on but juuuuust barely, there's no way you'd be able to see it during the day but in the pitch black of night you can just barely see that it's ever so slightly lit up which is odd.

It's definitely got a different tune, I only drove it around for 5 or 10 minutes but the first thing I noticed is that the revs don't drop as quickly and it idles at around 1,500 when you're coming to a stop, hangs there for a second, and then comes down to where it should be.

There's definitely a higher rev limit, according to the tach it's not quite 7,500 probably closer to 7,400 or 7,300 but who knows how accurate the OEM tch is and it's definitely higher than before so that's pretty cool.

Power feels about the same but again I only drove it for a very short period of time so I'll know more tomorrow after I can spend some more time in it.

I just sorta stuffed it up under the dash so that I can swap back and forth between it and the regular ECU to get some back to back comparisons and I'm scheduling dyno time soon to have the Greddy E-Manage tuned so maybe I'll even get some head to head numbers between the two ECU's, I'm curious as hell

Originally Posted by scenturion View Post
Ordered from where? YAJ?
I should be getting mine on Monday, but probably wont be able to try it for a while.
I got mine from JDM Engine Depot
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Old 08-24-2013, 10:57 AM   #22
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So Ciotti, any updates? Also interested if this was installed in a CA Emissions car or a 49 state car, and what PN ECU you used.

Other than the RB header, are you running a 5A cam or squaretop on your 99? I'm curious to see what the wideband says. Also, were you able to scan that CEL?

Last edited by EO2K; 10-01-2013 at 07:54 PM.
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Old 10-06-2014, 11:46 PM   #23
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Sorry for bringing up an old thread, but instead of starting a new one I'll just add my experience. I just recently did a bp5a swap and currently running the bp5a ecu also. To better represent the jdm layouts I have converted my returnless fuel system to a true fuel return system using an na8 fuel feed line. From there I followed a diy link on miata turbo.net and have a successful fuel return system running the jdm 60psi fpr.

Motor jdm bp5a motor has the provisions for egr and egr tube. They are just blocked off and not used. The bp5a also came with a working vics system. From driving I can say the cold tune is different and top end pull is much more fulfilling versus the bp4y ecu. Currently only mod is a rb 4-1 header and custom rear muffler section. I do however have a lot of afterfire ... On throttle release and in between shifts. So far no issues and the pin outs seems correct. Please don't quote me on in-depth details as I have only been able to drive the vehicle about 40 miles , and then my fm pressure plate gave up on me. As far as the jdm ecu working I can a say that it will be a pnp in our us spec nb1.
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Old 11-06-2014, 07:59 AM   #24
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NB1 and NB2 cars are being broken left right and centre in the UK due to chronic rust - if you guys in the states are after parts then UK ebay, breakers, making contact on UK forums would be a good way to go. Parts are generally cheap too (Unlike rest of Europe etc) as old cars have very little value.
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Old 11-06-2014, 08:15 AM   #25
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Holy crap, I thought we had bad rust in new england, I guess the rust is worse in old england Most NBs I see arent even as rusty as my and I think I've seen a total of 1 rusted out bad enough that I would think about just parting it out and scrapping it because its unsafe (and that was an MSM, too bad he wanted 5k). I guess maybe the UK NBs didnt get the enhanced rust proofing that they did in the states.
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